Da Cunha K.D., Cazicava J., Coelho M.J., Leite C.V.B. (2006). PIXE, Cf-252-PDMS and radiochemistry applied for soil and vegetable analysis. Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms, 243 (1), p. 179-186. ISSN 0168-583X.
Titre du document
PIXE, Cf-252-PDMS and radiochemistry applied for soil and vegetable analysis
Da Cunha K.D., Cazicava J., Coelho M.J., Leite C.V.B.
Source
Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms, 2006,
243 (1), p. 179-186 ISSN 0168-583X
The aim of this work is to identify the elements present in vegetables and soils using PIXE (particle induced X-rays emission) and Cf-252-PDMS (Cf-252 plasma desorption mass spectrometry) techniques in order to estimate the possible influence of soil and agricultural techniques in the metal absorption by the vegetables. In this work, metal concentrations were evaluated in soil and vegetable samples from several regions, where different agricultural techniques were employed. Si, Zr, Ce, Th, Sc and Pb identified in the soil samples were not biologically available. Ga, Ge, As and Br identified in the tubercles indicate that spray pesticide used on the vegetable leaves was absorbed by them. Th-232 and U-238 present in the soil were not absorbed by the vegetables. The airborne particles from anthropogenic sources (as CFn, VCn) were absorbed by the vegetables. Compounds from mineral sources present in soil as V+, VCO3, HPO4, Cr+, CrOH+, Mn+, FeH+, Fe(OH)(n) and in the bioorganic compounds as N+, Ca(CN)(n)(+) and CnH+ were identified in vegetables. The metal absorption by the vegetables is not dependent of the metal concentration in soil. Different tubercles cultivated in the same soil show similar metal absorption. The exogenous contributions such as the elements present in water irrigation, pesticides, fertilizers and airborne particles deposited on leaves can be absorbed by vegetables. The absorption by the roots depends on the chemical compound of the elements. The use of pesticide sprays and air pollution can cause more contamination in the vegetables than in soil. The use of this methodology allows the identification of possible sources of metals in soils and in vegetables and the metal speciation. (c) 2005 Elsevier B.V. All rights reserved.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020]
